Mechanical movement.



'No. 658,557. Patented Sept. 25, I900.

' W. A. PITT.

MECHANICAL MOVEMENT.

(Application filed June 16, 1899. Renewed Aug. 23, 1900.)

(No Model.)

INVENTOR ATTORNEY m: mums PEYERS c0. PHOTO-LUNG" wasnmo'ron. u. c.

llNrrE STATES ATENT OFFICE.

WILLIAM A. PITT, or MANHASSET, NEW YORK.

MECHANICAL MOVEMENT.

QPEUIFICATION forming part of Letters Patent N 0. 658,557, datedSeptember 25, 1900.

Application filed June 16, 1899. Renewed August 23, 1900. Serial No.27.821. (N0 model.)

To all whom it may concern.-

Be it known that I, VVILLIAM A. PITT, a citizen of the United States,residing at Manhasset, in the county of Nassau and State of New York,have invented certain new and useful Improvements in MechanicalMovements, of which the following is a specification.

This invention relates to mechanisms designed for converting motioneither from slow to fast or fast to slow without the aid of gears. Itmay be applied in many Ways, that herein shown being the conversion ofrelatively-slow reciprocating motion into relatively-rapid rotarymotion.

In the accompanying drawings, which illustrate an embodiment of theinvention, Figure 1 is a somewhat-diagrammatic side elevation of thedevice as applied to the rotation of a shaft by a reciprocating engineand its connecting-rod, and Fig. 2 is a section at x in Fig. 1. Fig. 3is a view illustrating an antifriction construction of the eccentric.Fig. 4 is a diagram illustrating the relative proportion of the partsand the manner of obtaining the proper form of the triangular body. Fig.5 is a sectional view illustrating a ball-bearing for the eccentric.Fig. 6 is a View showing a slightly-difierent form of the triangularbody.

Let 1 represent a square frame, whichis fixed, and 2 arotatively-mounted shaft, the axis of which coincides with the center ofsaid square. On the shaft 2 is keyed or otherwise secured an eccentric3, which exactly fits a circular aperture in an equilateral triangularbody 4, the said triangular body being within the frame 1.

Fig. 4 clearly shows the manner of drawing and proportioning the parts.For eX- ample, the body 4 is drawn from three centers a a a at thevertices of an equilateral triangle, having sides I) b b, said sidesbeing equal in length to the respective sides 0 c c c of thecircumscribed square. The center d of the eccentric 3 coincides with thecenter of the triangular body. Now if we rotate the triangular body 4 inthe square frame 1 the effect will be to rotate the shaft 2 in theopposite direction and ata speed three times as great; or, conversely,if we rotate the shaft 2 it will drive the triangular body and rotatethe latter at a speed one-third as great as that of the shaft.

Figs. 1 and 2 show the body 4 adapted to be rotated in the manner of acrank from a reciprocating engine. A represents the engine-cylinder; B,the piston rod thereof, and O the connecting-rod'thereof, coupled to acrank-pin 5 in the body 4. Obviously by rotating the shaft 2 through themedium of any driver reciprocating motion will be imparted to thepiston-rod B.

Fig. 3 shows a modified form of the eccentric 3, wherein it is providedwith three bearing-points, two of which are supplied withantifriction-rollers 6. Fig. 5 shows another antifriction device betweenthe eccentric 3 and the triangular body 4. This device comprises aseries of balls 6 in the nature of a ball-bearing, the eccentric beingin two sections to serve as cones.

Fig. 6 shows a construction wherein the convex faces of the body 4 aredrawn from the same centers as beforeas in Fig. 4, for

examplebut with a longer radius, whereby a round form is imparted to theangles of the body 4, and wearing-plates 7 are setin the respectiverounded vertices to bear on the faces of the inclosing square 1. In thisconstruction the curves 1 are shown at the angles of the square 1,forming fillets.

These variations do not in the least aifect the fundamental operation ofthe movement.

It will be noted that with my movement the transmitted rotary motion,whether from the triangular body 4 to the shaft 2 or vice versa, iseither increased or diminished, and this without the aid of gear-wheelsor other ordinary means for varying rotary speed, and this is effectedwithout regard to the manner of applying power to the prime mover.

Being the first,as I believe,to employ the instrumentalities shown forthe purpose set forth, I do not limit myself to the specificconstruction shown, nor to any application of the movement, nor to anyparticular means of applying power to the triangular body or the shaftfor driving.

What is herein referred to as a square frame 1 is intended to includeany square space in a fixed part which has four plane sides. The anglesof the space may in any the center of said chamber, an eccentric fixedon said shaft within said chamber, and an 15' equilateral-triangularbody, with rounded faces, within said chamber and embracing saideccentric, the center of said triangular body being coincident with thecenter of said eccentric, substantially as set forth.

In witness whereof Ihave hereunto signed my name, this 8th day of June,1899, in the presence of two subscribing witnesses:

, WILLIAM A. PITT.

Witnesses:

HENRY CQNNETT, PETER A. Ross.

